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                <h2 id="Linux下建立压缩包，解压缩包命令"><a href="#Linux下建立压缩包，解压缩包命令" class="headerlink" title="Linux下建立压缩包，解压缩包命令"></a>Linux下建立压缩包，解压缩包命令</h2><ul>
<li>tar<ul>
<li>打包：<code>tar czvf filename.tar dirname</code></li>
<li>解压：<code>tar xzvf filename.tar</code></li>
</ul>
</li>
<li>gz<ul>
<li>解压1：<code>gunzip filename.gz</code></li>
<li>解压2：<code>gzip -d filename.gz</code></li>
<li>压缩：<code>gzip filename.tar.gz</code>和<code>.tgz</code></li>
</ul>
</li>
</ul>
<h2 id="请写出数据类型-int-char-varchar-datetime-text-的意思；请问-varchar-和-char有什么区别？"><a href="#请写出数据类型-int-char-varchar-datetime-text-的意思；请问-varchar-和-char有什么区别？" class="headerlink" title="请写出数据类型(int char varchar datetime text)的意思；请问 varchar 和 char有什么区别？"></a><strong>请写出数据类型(int char varchar datetime text)的意思；请问 varchar 和 char有什么区别？</strong></h2><blockquote>
<p>Int 整数 char 定长字符 Varchar 变长字符 Datetime 日期时间型 Text 文本型 Varchar 与char的区别 char是固定长度的字符类型，分配多少空间，就占用多长空间。 Varchar是可变长度的字符类型，内容有多大就占用多大的空间，能有效节省空间。 由于varchar类型是可变的，所以在数据长度改变的时，服务器要进行额外的操作，所以效率比char类型低。</p>
</blockquote>
<h2 id="MyISAM-和-InnoDB-的基本区别？索引结构如何实现？"><a href="#MyISAM-和-InnoDB-的基本区别？索引结构如何实现？" class="headerlink" title="MyISAM 和 InnoDB 的基本区别？索引结构如何实现？"></a><strong>MyISAM 和 InnoDB 的基本区别？索引结构如何实现？</strong></h2><p>MyISAM类型不支持事务，表锁，易产生碎片，要经常优化，读写速度较快，而InnoDB类型支持事务，行锁，有崩溃恢复能力。读写速度比MyISAM慢。</p>
<p>创建索引：<code>alert table tablename add index (</code>字段名<code>)</code></p>
<h2 id="任意进制转换的函数"><a href="#任意进制转换的函数" class="headerlink" title="任意进制转换的函数"></a>任意进制转换的函数</h2><p><code>base_convert</code></p>
<blockquote>
<p>返回一字符串，包含 number 以 tobase 进制的表示。number 本身的进制由 frombase 指定。frombase 和 tobase 都只能在 2 和 36 之间（包括 2 和 36）。高于十进制的数字用字母 a-z 表示，例如 a 表示 10，b 表示 11 以及 z 表示 35。</p>
</blockquote>
<p>Warning!</p>
<p>由于使用内部的 “double” 或 “float” 类型，<strong>base_convert()</strong> 的操作可能会导致大数值中的精度丢失。请参见本手册的 <a href="https://www.php.net/manual/zh/language.types.float.php" target="_blank" rel="noopener">浮点数</a> 章节以便获得更多详细信息。</p>
<hr>
<h3 id="参数"><a href="#参数" class="headerlink" title="参数"></a>参数</h3><p><code>number</code>：要转换的数字</p>
<p><code>frombase</code>：数字本身的进制</p>
<p><code>tobase</code>：要转换的进制</p>
<h3 id="返回值"><a href="#返回值" class="headerlink" title="返回值"></a>返回值</h3><p>返回一个转换完了之后的字符串</p>
<h2 id="SQL调优"><a href="#SQL调优" class="headerlink" title="SQL调优"></a>SQL调优</h2><h3 id="目的"><a href="#目的" class="headerlink" title="目的"></a>目的</h3><p>SQL调优，是通过综合分析SQL的执行计划、执行监控信息、系统配置、系统负载等多方面因素，调整SQL的执行策略，以使其符合预期的过程。</p>
<h3 id="SQL调优的目的一般分为2类"><a href="#SQL调优的目的一般分为2类" class="headerlink" title="SQL调优的目的一般分为2类"></a>SQL调优的目的一般分为2类</h3><ol>
<li><p>针对单一SQL的调优</p>
<p>针对单一SQL的调优的优化主体是被调试的SQL执行本身，一般调优的目标可以包括该SQL的执行时间、试行期的资源消耗等等，常见的调优手段包括调整访问路径、执行顺序、逻辑改写等等。</p>
</li>
<li><p>针对系统的SQL调优</p>
<p>针对系统的SQL调优过程往往比较复杂，需要综合分析当前系统的负载特征，结合多条SQL的执行计划分析问题的症结所在，目标往往是提高整个系统的吞吐量或者系统利用率等等，关注的问题也往往超越了单条SQL的执行计划，例如热点行竞争、buffer cache命中率等全局性的调优点。</p>
</li>
</ol>
<h2 id="查询数据库中某张表的前几行"><a href="#查询数据库中某张表的前几行" class="headerlink" title="查询数据库中某张表的前几行"></a>查询数据库中某张表的前几行</h2><p><code>select * from student limit 5</code>；取出前5条记录</p>
<p>在<code>mysql</code>中取出表中前几条记录是用关键字<code>limit</code>，而在<code>sql-server</code>中则是使用<code>top</code>关键字</p>
<pre class=" language-sql"><code class="language-sql"><span class="token keyword">select</span> <span class="token operator">*</span> <span class="token keyword">from</span> student <span class="token keyword">limit</span> <span class="token number">0</span> <span class="token punctuation">,</span><span class="token number">5</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true">//取出前五条记录</span>
<span class="token keyword">select</span> <span class="token operator">*</span> <span class="token keyword">from</span> student <span class="token keyword">limit</span> <span class="token number">3</span><span class="token punctuation">,</span><span class="token number">10</span><span class="token punctuation">;</span><span class="token comment" spellcheck="true">//取出3后面的10条记录,不包括3</span>
<span class="token keyword">select</span><span class="token operator">*</span><span class="token keyword">from</span> student <span class="token keyword">order</span> <span class="token keyword">by</span> rand<span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">limit</span> <span class="token number">2</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true">// 从表中随机取出2 条记录，这里2 可以自己改</span></code></pre>
<h2 id="Linux查看进程命令"><a href="#Linux查看进程命令" class="headerlink" title="Linux查看进程命令"></a>Linux查看进程命令</h2><p><code>ps</code>命令：</p>
<ul>
<li>-a：查看所有</li>
<li>-u：以用户(user)的格式显示</li>
<li>-x：显示后台进程运行参数</li>
<li>-ef：以全格式显示进程所有信息，包括父进程Pid，创建人，创建时间，进程号。。。等等</li>
</ul>
<pre class=" language-bash"><code class="language-bash"><span class="token function">ps</span> -a <span class="token operator">|</span> <span class="token function">grep</span> helloworld
或
<span class="token function">ps</span> -ef <span class="token operator">|</span> <span class="token function">grep</span> helloworld</code></pre>
<blockquote>
<p>查询到helloworld相关的进程</p>
</blockquote>
<h2 id="在浏览器地址栏输入URL，按下回车后究竟发生了什么？"><a href="#在浏览器地址栏输入URL，按下回车后究竟发生了什么？" class="headerlink" title="在浏览器地址栏输入URL，按下回车后究竟发生了什么？"></a>在浏览器地址栏输入URL，按下回车后究竟发生了什么？</h2><ol>
<li>输入域名</li>
<li>浏览器查找域名的ip地址<ol>
<li>查找浏览器缓存</li>
<li>查找系统 缓存</li>
<li>查找路由器缓存</li>
<li>递归查询</li>
<li>迭代查询</li>
</ol>
</li>
<li>浏览器与目标服务器建立TCP连接<ol>
<li>主机浏览器通过NDS解析得到了目标服务器的IP地址后，与服务器建立TCP连接</li>
<li>TCP3次握手连接</li>
</ol>
</li>
<li>浏览器通过http协议发送请求</li>
<li>某些服务会做永久重新向响应</li>
<li>浏览器 跟踪重定向地址</li>
<li>服务器处理请求</li>
<li>服务器发送一个HTML响应</li>
<li>释放TCP连接</li>
<li>浏览器显示页面</li>
<li>浏览器发送获取嵌入在HTML中的其他内容</li>
</ol>
<h2 id="一根不均匀的绳子，全部烧完需要1个小时，问怎样烧能计时1个小时15分钟"><a href="#一根不均匀的绳子，全部烧完需要1个小时，问怎样烧能计时1个小时15分钟" class="headerlink" title="一根不均匀的绳子，全部烧完需要1个小时，问怎样烧能计时1个小时15分钟"></a>一根不均匀的绳子，全部烧完需要1个小时，问怎样烧能计时1个小时15分钟</h2><p>【答：取出三条绳子。1、同时点燃“第一根的两头”和“第二根的一头”，第一根烧完时间过了“30分钟”；2、第一根烧完后马上点燃第二根的另一头，到第二根烧完时间又过了“15分钟”；3、第二根烧完后马上点燃第三根绳子的两头，当第三根烧完时间又用了“30分钟”。加起来总共=30+15+30=75分钟=一个小时十五分钟。。】</p>
<h2 id="Linux如何更改文件的权限"><a href="#Linux如何更改文件的权限" class="headerlink" title="Linux如何更改文件的权限"></a>Linux如何更改文件的权限</h2><h3 id="1-文件属性查看"><a href="#1-文件属性查看" class="headerlink" title="1. 文件属性查看"></a>1. 文件属性查看</h3><pre class=" language-bash"><code class="language-bash"><span class="token function">ls</span> -l filename</code></pre>
<ul>
<li>”-“：文件类型    -：普通文件</li>
<li>d：目录</li>
<li>c：字符设备</li>
<li>s：套接字</li>
<li>p：管道</li>
<li>b：快设备</li>
<li>l：连接</li>
</ul>
<h3 id="2-文件读写权限-”rw-r–r–-“"><a href="#2-文件读写权限-”rw-r–r–-“" class="headerlink" title="2. 文件读写权限  ”rw-r–r–-“"></a>2. 文件读写权限  ”rw-r–r–-“</h3><table>
<thead>
<tr>
<th>rw-</th>
<th>r–</th>
<th>r–</th>
</tr>
</thead>
<tbody><tr>
<td>u</td>
<td>g</td>
<td>o</td>
</tr>
</tbody></table>
<p>rw- | r–|r–</p>
<p>u |g |o</p>
<p>u：所有人的权限</p>
<p>g：所有组的权限</p>
<p>o：其他人的权限</p>
<h3 id="3-文件所有人所有组的管理"><a href="#3-文件所有人所有组的管理" class="headerlink" title="3. 文件所有人所有组的管理"></a>3. 文件所有人所有组的管理</h3><pre class=" language-bash"><code class="language-bash"><span class="token function">chown</span> username <span class="token function">file</span><span class="token operator">|</span><span class="token function">dir</span>  <span class="token comment" spellcheck="true">## 更改文件的所有人</span>
<span class="token function">chgrp</span> groupname <span class="token function">file</span><span class="token operator">|</span><span class="token function">dir</span> <span class="token comment" spellcheck="true">## 更改所有组</span>
<span class="token function">chown</span> -R username <span class="token function">dir</span> <span class="token comment" spellcheck="true">## 更改目录本身及里面所有内容的所有人</span>
<span class="token function">chgrp</span> -R groupname <span class="token function">dir</span> <span class="token comment" spellcheck="true">## 更改目录本身及里面所有内容的所有组</span></code></pre>
<h3 id="4-字符方式修改该文件权限"><a href="#4-字符方式修改该文件权限" class="headerlink" title="4. 字符方式修改该文件权限"></a>4. 字符方式修改该文件权限</h3><pre class=" language-bash"><code class="language-bash"><span class="token function">chown</span> u-x file1 <span class="token comment" spellcheck="true">## file1拥有者去掉x权限</span>
<span class="token function">chmod</span> g+w file1 <span class="token comment" spellcheck="true">## file1拥有组添加w权限</span>
<span class="token function">chmod</span> u-x,g+w file1 <span class="token comment" spellcheck="true">## file1拥有者去掉x权限，file1拥有组添加w权限</span>
<span class="token function">chmod</span> ugo-r file2        <span class="token comment" spellcheck="true">##file2的用户组其他人去掉r权限</span>
<span class="token function">chmod</span> ug+x,o-r file3        <span class="token comment" spellcheck="true">##file3用户和组添加x权限，其他人去掉r权限</span></code></pre>
<h3 id="5-数字方式修改该文件权限"><a href="#5-数字方式修改该文件权限" class="headerlink" title="5. 数字方式修改该文件权限"></a>5. 数字方式修改该文件权限</h3><p>在linux中</p>
<p>r = 4</p>
<p>w = 2</p>
<p>x = 1</p>
<p>文件权限数字表示方式</p>
<p>rw- | r–|r–</p>
<p>u |g |o</p>
<pre class=" language-bash"><code class="language-bash">u <span class="token operator">=</span> rw-<span class="token operator">=</span>4+2+0<span class="token operator">=</span>6
g<span class="token operator">=</span>r--<span class="token operator">=</span>4+0+0<span class="token operator">=</span>4
o<span class="token operator">=</span>r--<span class="token operator">=</span>4+0+0<span class="token operator">=</span>4</code></pre>
<p>所以文件权限表示为644</p>
<p>7 = rwx</p>
<p>6=rw-</p>
<p>5=r-x</p>
<p>4=r–</p>
<p>3=-wx</p>
<p>2=-w-</p>
<p>1=–x</p>
<p>0=—-  这里是三个-</p>
<h2 id="isset-和-empty-区别"><a href="#isset-和-empty-区别" class="headerlink" title="isset() 和 empty() 区别"></a><strong>isset() 和 empty() 区别</strong></h2><p>Isset判断变量是否存在，可以传入多个变量，若其中一个变量不存在则返回假，empty判断变量是否为空为假，只可传一个变量，如果为空为假则返回真。</p>
<h2 id="请说明-PHP-中传值与传引用的区别。什么时候传值什么时候传引用？"><a href="#请说明-PHP-中传值与传引用的区别。什么时候传值什么时候传引用？" class="headerlink" title="请说明 PHP 中传值与传引用的区别。什么时候传值什么时候传引用？"></a>请说明 PHP 中传值与传引用的区别。什么时候传值什么时候传引用？</h2><p>按值传递：函数范围内对值的任何改变在函数外部都会被忽略</p>
<p>按引用传递：函数范围内对值的任何改变在函数外部也能反映出这些修改</p>
<p>优缺点：按值传递时，php必须复制值。特别是对于大型的字符串和对象来说，这将会是一个代价很大的操作。按引用传递则不需要复制值，对于性能提高很有好处。</p>
<h2 id="数组中所有元素都用小写字母，并按照字母先后次序排序"><a href="#数组中所有元素都用小写字母，并按照字母先后次序排序" class="headerlink" title="数组中所有元素都用小写字母，并按照字母先后次序排序"></a>数组中所有元素都用小写字母，并按照字母先后次序排序</h2><pre class=" language-php"><code class="language-php"><span class="token keyword">class</span> <span class="token class-name">Sort</span>
<span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token variable">$str</span><span class="token punctuation">;</span>

    <span class="token comment" spellcheck="true">/**
     * 有参构造
     * Sort constructor.
     * @param $str
     */</span>
    <span class="token keyword">public</span> <span class="token keyword">function</span> <span class="token function">__construct</span><span class="token punctuation">(</span><span class="token variable">$str</span><span class="token punctuation">)</span>
    <span class="token punctuation">{</span>
        <span class="token variable">$this</span><span class="token operator">-</span><span class="token operator">></span><span class="token property">str</span> <span class="token operator">=</span> <span class="token variable">$str</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">public</span> <span class="token keyword">function</span> <span class="token function">explodes</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">{</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">empty</span><span class="token punctuation">(</span><span class="token variable">$this</span><span class="token operator">-</span><span class="token operator">></span><span class="token property">str</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token keyword">return</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token variable">$arr</span> <span class="token operator">=</span> <span class="token function">explode</span><span class="token punctuation">(</span><span class="token string">" "</span><span class="token punctuation">,</span> <span class="token variable">$this</span><span class="token operator">-</span><span class="token operator">></span><span class="token property">str</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token keyword">return</span> <span class="token function">is_array</span><span class="token punctuation">(</span><span class="token variable">$arr</span><span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token variable">$arr</span> <span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token keyword">array</span><span class="token punctuation">)</span><span class="token variable">$arr</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">public</span> <span class="token keyword">function</span> <span class="token function">sort</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">{</span>
        <span class="token variable">$explode</span> <span class="token operator">=</span> <span class="token variable">$this</span><span class="token operator">-</span><span class="token operator">></span><span class="token function">explodes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token function">sort</span><span class="token punctuation">(</span><span class="token variable">$explode</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token keyword">return</span> <span class="token variable">$explode</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token variable">$str</span> <span class="token operator">=</span> <span class="token string">'Apple Orange Banana Strawberry'</span><span class="token punctuation">;</span>

<span class="token variable">$sortob</span> <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Sort</span><span class="token punctuation">(</span><span class="token variable">$str</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token variable">$sortob</span><span class="token operator">-</span><span class="token operator">></span><span class="token function">sort</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span></code></pre>
<h2 id="自动加载类的正确方式"><a href="#自动加载类的正确方式" class="headerlink" title="自动加载类的正确方式"></a>自动加载类的正确方式</h2><pre class=" language-php"><code class="language-php"><span class="token keyword">function</span> <span class="token function">__autoload</span><span class="token punctuation">(</span><span class="token variable">$class_name</span><span class="token punctuation">)</span></code></pre>
<h2 id="PHP的数组相关的函数"><a href="#PHP的数组相关的函数" class="headerlink" title="PHP的数组相关的函数"></a>PHP的数组相关的函数</h2><pre class=" language-php"><code class="language-php"><span class="token keyword">array</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">--</span><span class="token operator">--</span>创建数组

<span class="token function">array_combine</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">--</span><span class="token operator">--</span>通过合并两个数组来创建一个新数组

<span class="token function">range</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">--</span><span class="token operator">--</span>创建并返回一个包含指定范围的元素的数组

<span class="token function">compact</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">--</span><span class="token operator">--</span>建立一个数组

<span class="token function">array_chunk</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">--</span><span class="token operator">--</span>将一个数组分割成多个

<span class="token function">array_merge</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">--</span><span class="token operator">--</span>把两个或多个数组合并成一个数组

<span class="token function">array_slice</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">--</span><span class="token operator">--</span>在数组中根据条件取出一段值

<span class="token function">array_diff</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">--</span><span class="token operator">--</span>返回两个数组的差集数组

<span class="token function">array_intersect</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">--</span><span class="token operator">--</span>计算数组的交集

<span class="token function">array_search</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">--</span><span class="token operator">--</span>在数组中搜索给定的值

<span class="token function">array_splice</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">--</span><span class="token operator">--</span>移除数组的一部分且替代它

<span class="token function">array_key_exists</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">--</span><span class="token operator">--</span>判断某个数组中是否存在指定的key

<span class="token function">shuffle</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">--</span><span class="token operator">--</span>把数组中的元素按随机顺序重新排列

<span class="token function">array_flip</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">--</span><span class="token operator">--</span>交换数组中的键和值

<span class="token function">array_reverse</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">--</span><span class="token operator">--</span>将原数组中的元素顺序翻转，创建新的数组并返回

<span class="token function">array_unique</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">--</span><span class="token operator">--</span>移除数组中重复的值
</code></pre>
<h2 id="MySQL命令"><a href="#MySQL命令" class="headerlink" title="MySQL命令"></a>MySQL命令</h2><pre class=" language-mysql"><code class="language-mysql">show databases;  ## 显示当前mysql服务器中有哪些数据库
show create database mysql; ## 显示创建数据库的sql语句
show create table user; ## 显示创建表的sql语句
desc user; ## 查询user表的结构
explain select * from user;  ## 获取select相关信息
show processlist; ## 显示哪些线程正在运行
SHOW VARIABLES;  ## 显示系统变量和值
SHOW VARIABLES like ’%conn%’;  ## 显示系统变量名包含conn的值
</code></pre>
<h2 id="面向对象中接口和抽象类的区别及应用场景"><a href="#面向对象中接口和抽象类的区别及应用场景" class="headerlink" title="面向对象中接口和抽象类的区别及应用场景?"></a><strong>面向对象中接口和抽象类的区别及应用场景?</strong></h2><p>1、有抽象方法的类叫做抽象类，抽象类中不一定只有抽象方法，抽象方法必须使用abstract关键字定义。</p>
<p>2、接口中全部是抽象方法,方法不用使用abstract定义。</p>
<p>3、当多个同类的类要设计一个上层，通常设计为抽象类，当多个异构的类要设计一个上层，通常设计为接口。</p>
<h2 id="对于大流量的网站-您采用什么样的方法来解决访问量问题"><a href="#对于大流量的网站-您采用什么样的方法来解决访问量问题" class="headerlink" title="对于大流量的网站,您采用什么样的方法来解决访问量问题?"></a>对于大流量的网站,您采用什么样的方法来解决访问量问题?</h2><p>优化程序，优化数据库，如果程序和数据库已经最优化，使用以下解决方法：</p>
<p>1、确定当前服务器设备是否满足流量需求。</p>
<p>2、使用Memcache缓存技术，把动态内容缓存到文件中，动态网页直接调用这些文件，而不必再访问数据库。</p>
<p>3、禁止外部盗链，图片和文件外部盗链会给服务器带来大量的负载压力，可以通过refer来禁止外部盗链，或者使用apache来配置禁止盗链。</p>
<p>4、控制大文件的下载，大文件的下载对于非SCSI硬盘来说会占用大量的资源，导致服务器的响应能力下降。</p>
<p>5、使用不同的主机分流主要流量，使服务器均衡负载。</p>
<p>6、使用流量统计软件统计分析网站流量，可以知道哪些地方耗费了大量的流量，哪些页面需要再进行优化。</p>

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